Abstract: A gearless, direct drive, multiple axes rotary head for a machine tool is provided which includes a spindle mounted to the rotary head for rotation thereon about multiple axes and a plurality of motors coupled to the head and spindle for directly driving and controlling the rotation the head and spindle about the multiple axes respectively.

Abstract: The present invention relates to a computer aided design and manufacturing system. The system comprises a platform suspended by means of three pairs of supportive legs which are coupled at triangularly spaced-apart locations by means of three universal joints, each of which couples to one end of each of the two legs of a respective pair. The two legs of each pair extend from their respective universal joint in divergent directions to spaced-apart locations in an overhead mounting where each leg is drivingly engaged by a respective gimbal-mounted electric motor arranged to move the leg in its own longitudinal direction. The platform position and orientation can be controlled by appropriate operation of the six leg drive motors.

Abstract: A space frame system for use with a machine, such as a machine tool, is disclosed. The system as used with a machine tool includes a base and a machine component, such as a workpiece support, mounted to the base. A first space frame is mounted solely to the workpiece support. A second and separate space frame is connected to the first space frame by a plurality of extensible legs. Another machine component, such as a tool holder, is rigidly mounted to the second space frame for cooperation with a workpiece mounted on the workpiece support. Thus, as the extensible legs are independently controlled, the tool holder is moved along a desired path with respect to the workpiece support to perform various cutting operations on the workpiece.

Abstract: The milling head (1) comprises:a principal body (2),an interposed piece (5), which is mounted to rotate on the principal body (2) and which is equipped with a first crown gear (12a),means for driving and for blocking in rotation the interposed piece (5) with respect to the body (2),a spindle-holder (3), which is mounted to rotate along axis XX' with respect to the interposed piece (5), on which is fixed a second crown (12b) adapted to mesh with the first crown (12a), and which is mobile in translation along axis XX' between a position of blockage in rotation in which the crown gears (12a, 12b) mesh in one another, and a position of setting in rotation in which the two crown gears (12a, 12b) are out of mesh,means (13) for setting in translation the spindle-holder (3) between the positions of blockage and of setting in rotation,and means (17, 18, 19) for setting in rotation the spindle-holder (3) along axis XX'.

Abstract: A machine tool isolation system is disclosed. The preferred system includes a pair of platforms connected by a plurality of legs. A tool is typically connected to one platform, and a workpiece to the other. The legs are able to move one platform with respect to the other which can create vibrations. A base, typically formed by a plurality of legs, is mounted to one of the platforms to support the two platforms and legs connected therebetween. A vibration isolator is disposed between the base legs and the floor or other support on which the entire system is mounted.

Abstract: A universal milling and drilling machine provided with a swivel milling head for an automatic reset from horizontal to vertical machining. The driving of the work spindle is carried out by a driving motor via bevel gears and a shift transmission which ensures a high torque even in a low rotation speed range. For optimizing the power transmission between the driving motor and the work spindle, the shift transmission is arranged in the swivel milling head, and the bevel gear transmission is seated directly on the motor shaft of the driving motor. The swivel milling head is mounted on the front surface of a support housing, the front surface being downwardly inclined by 45.degree..

Abstract: A milling apparatus 2 including an articulated cutter 20 and an inverted L-shaped frame 10 for removing a unique geometric volume of bone to receive a prosthetic implant stem. Cutter 20 is housed within frame 10 for rotational movement about its longitudinal axis and lateral movement along a guide 16, which extends laterally from frame 10. Cutter 20 includes a pair of articulated arms 30, 32 each carrying a plurality of cutting blades 40. The proximal end 22 of cutter 20 is seated in an elongated non-radial race 17 formed in guide 16. Articulated arms 30, 32 provide a "scissoring" action which allows cutter 20 to be compressed longitudinally when shifted to one end of race 17 and extended longitudinally when shifted to the opposite end of race 17. The scissoring action of arms 30, 32 also changes the angle of the cutting face of blades 40 carried by arms 30, 32. Consequently, milling apparatus 2 creates a receiving cavity having an egg-shaped cross section.

Abstract: A pivotable joint usable, for instance, with a multi-legged machine tool, is disclosed. The basic design of the joint includes a central block to which is connected a first yoke pivotably mounted for motion about one axis. A second yoke is also pivotably mounted to the central block for motion about a second axis. The central block includes an opening extending therethrough between two surfaces, and the cross-sectional area of the opening decreases towards the central region of the block. This type of opening permits the use of an extensible mounting leg having a rod that moves through the opening during pivoting of the joint.

Abstract: A machine tool with a work supporting table is disclosed having a main shaft rail body with vertically extending sliding rails located in a vertical plane extending obliquely to a front face. A sliding machine seat is slidably mounted on the vertically extending sliding rails and has a first mounting surface extending parallel to the vertical plane of the sliding rails. A second machine seat having a second mounting surface located in a plane extending obliquely to the vertical plane of the sliding rails is rotatably attached to the first mounting surface. A main shaft machine seat is attached to the second machine seat.

Abstract: This invention relates to a machine tool providing a unique approach towards positioning and movement for a workpiece and tool in numerical control machine tool applications. The goal is to provide decrease machine costs and maintenance. Current machine tools such as milling machines principally rely on linear sliding mechanisms to position a table and workpiece relative to a spindle and provide motion for cutting. In accordance with this invention motion and positioning is achieved through less cost and readily available mechanisms through use of a plurality of revolute joints. Arms are provided having tangential actuators featuring extremely high stiffness and zero backlash actuator capable of a high degree of positioning accuracy. The arms resemble three dimensional truss structures for added structural stiffness characteristics. Preferably a cable drum type tangential actuator is employed in conjunction with this invention.

Abstract: In a cutting machine having an octahedral framework, a cutting tool is carried by a servostrut support having a platform mounted on extendable and retractable struts. In order to reduce deflections and to limit transfer of bending moments, from the servostrut support to the other connected support sections of the framework, the six struts are mounted at pivot mounts such as ball joints in a triangular support. Three of the pivotal mounts are positioned in a first triangle and in corners of the triangle support, and the other three struts are positioned in a second larger triangle in the triangular support. The nominal axis of rotation of spindle drive for the cutting tool may be either about nominal horizontal axis, a nominal vertical axis or a nominal 45.degree. axis. Several frameworks may be arranged to define a hollow tunnel with platforms projecting their cutting tools from opposite sides of the transfer tunnel.

Abstract: An improvement of spindle for vertical-horizontal machine tools, comprising a built-in motor type spindle, a rotating shaft, a drive device, and a locating-device, wherein the spindle is mounted on the machine tools by means of the rotating shaft; the rotating shaft maintains a 45.degree. incline toward the horizontal and vertical datum lines of the machine tools and is rotably driven by drive device to lead the spindle to change into vertical or horizontal manner; the locating device is provided for ensuring the spindle in accurate position. The characteristics of the invention are that the spindle mandrel is directly driven by a built-in motor within the spindle head; and the rotating shaft is defined to contain a hollow manner therein for the spindle pipelines and power cables to pass through its center.

Abstract: A machine such as a machine tool includes a pair of spaced platforms. One platform may mount an operator such as a tool in a spindle, and the other platform may mount an object such as a workpiece. The spaced platforms are joined by six powered and extensible legs joined to the respective platforms by universal joints. The length of the legs is individually manipulated to vary the positions of the platforms and, therefore, the object and operator relative to each other. Four of the legs are arranged into two pairs which are spaced apart to provide between them a part of a corridor for moving the workpiece into a working position. The two legs in each pair may cross each other. The other two legs extend away from each other and provide another part of the corridor between their inboard ends.

Abstract: An operating head for automatic machine tools, which includes a fork fitted on a support having various degrees of freedom; a mechanism for the numerical control of rotation of the fork around its axis; a support for a chuck, being fitted up on said fork and rotatably relative to it around an axis which is orthogonal to the former, under a numerical control; a shaft coaxial with the axis of rotation of the support for the chuck and connected, by the use of bevel gears, at one end to devices for the transmission of motion and, at its other end, to the shaft of the chuck wherein devices are provided for allowing change of the angular position of both the fork and support for the chuck, keeping the tool in contact with the piece to be machined.

Abstract: A machine such as a machine tool includes a pair of spaced platforms. One platform (11, 31, 185, 72, 159, 142) may mount an operator such as a tool in a spindle and the other platforms (10, 20, 180, 170, 144, 163) may mount an object such as a workpiece. The spaced platforms are joined by six powered and extensible legs (20-25, 40-45, 64-69, 145-150, 166, 182-84, 187-89) joined to the respective platforms by universal joints. The length of the legs is individually manipulated to vary the position of the platforms and, therefore, the object and operator relative to each other in six axes. The powered legs may be hydraulic cylinders (20-25) or recirculating ball screw driven (195, 197, 198). The distance between the spaced platforms may be measured by separate extensible instrument arms (130, 131, 171) which join the platforms. The instrument arms may use a digital position device (238, 240) to measure the extension and contraction of the instrument arms or may use a laser interferometer (267) for that purpose.

Abstract: A milling head is provided having an axially displacable spindle for retaining a machine tool, the spindle being pivotally movable with respect to a workhead, and the lower end of the machine tool lying on the axis of rotation. In a first embodiment, the spindle is rotatably mounted to the workhead via an angular carrier, and the workhead is axially movable. In a second embodiment, the workhead includes guide rails for guiding rotational movement of a plate-shaped structure with respect to the workhead, and the plate-shaped structure includes guides for controlling linear displacement of the angular carrier.

Abstract: Device for producing a drilled hole with an undercut in a facing panel, consisting of a drilling machine and a drilling tool for forming the drilled hole connected to the drilling machine via an adapter for transferring torque; and a holding device of a supporting stand having a swivel bearing for holding the drilling machine so that it can swivel with the drilling tool attached to it. To extend the service life of the drilling tool the adapter consists of a drive part connected to the drilling machine so as to transfer torque and a tool holder connectable with the drive part and a device for releasably securing the tool holder to the drive part so that the center line of the tool holder is inclined relative to the center line of the drive part, which is aligned with the drive axis of the drilling machine, so that only a portion of the circumference of the drilling tool engages the panel during formation of the drilled hole.

Abstract: This invention relates to an operating head for automatic machine tools of the type consisting of a fork with several degrees of freedom to which the support of a chuck is hinged, which can rotate arond an axis passing through the arms of the fork. In accordance with the invention clamping devices are provided, designed to lock the support of the chuck in any angular position to the fork, to perform power tasks with high precision.

Abstract: A machine tool frame is disclosed which is comprised of twelve struts connected together at their ends in six nodes to define the eight triangular panels of an octahedron. Forces generated by the operation of the machine tool are received by the frame at its nodes, being the nodes of opposed parallel triangular panels, upper and lower, in the specific examples illustrated. The octahedral frame displays superior rigidity due to its inherently closed kinematic loop, and to the virtual absence of bending stress in its constituent members accomplished by nodal loading. Movable machine elements are mounted upon six extensible and retractable servo-struts emanating in pairs from the nodes of a given triangular panel of the octahedral frame while opposing fixed elements located within the octahedral frame are supported tripodally from the frame nodes associated with a single triangular panel of the frame.

Abstract: An operating head for automatic machine tools consists of a fork (2) having a shaft (6) rotatably mounted to a support arm (1) for rotating around an axis (C). A motor chuck (5) is rotatably mounted between the arms of the fork and rotates around an axis (A). Axis (A) is orthogonal to axis (C). Drive systems (10,9,8) control the rotation of the fork (2) around the axis (C) by directly engaging the shaft (6). In order to transmit rotational motion for the fork (2) around support arm (1) and for the positioning motion of the motor chuck (5), a hypoid toothed crown wheel (8,13) and pinion (9,14) are used.

Abstract: The invention relates to improvements in a tilting mechanism for a saddle swivel head for a double housing type machine tool. The saddle swivel head 13 is provided at the sides thereof in the tilting direction with hydraulic cylinders 18R, 18L, to which is connected a hydraulic piping system 19 for giving swivel balancing pressures and back pressures when the swivel head 13 is tilted by a predetermined angle by a tilting driving mechanism. The saddle swivel head 13 is tilted while providing swivel balancing pressures to the hydraulic cylinders 18R, 18L, and after tilting the head by the predetermined angle, back pressures are applied to the hydraulic cylinders 18R, 18L to compensate for a tilting moment of the saddle swivel head 13.

Abstract: A device for producing drilled holes with an undercut, especially in facing panels, has a drilling machine, a drilling tool, an adaptor receiving the drilling tool and connected with the drilling machine so as to transfer torque, a holder, a bearing bush secured in the holder and provided with a rotatable and swivelable guide sleeve, a wobble plate secured on the drilling machine and the guide sleeve, a plurality of cylinders arranged on the holder concentrically about a center line of the guide sleeve and engaging the wobble plate. The cylinders are actuated and controlled in succession to produce a wobbling movement for reaming out an undercut in a drilled hole.

Abstract: The tool holder of modular construction of driven tools for use on lathes consists at least of one base holder and various tool heads connectable interchangeably therewith. The base holder has a fixing shank, an attachment flange connected thereto, as well as a drive shaft rotatably mounted therein. Each tool head has at least one rotatable tool receptacle in a housing and a drivable shaft connected thereto. On the mutually facing ends of the drive shaft and the driven shaft there are provided coupling parts which can couple without relative rotation therebetween. The driven shaft is provided on the input side with a support pin freely projecting beyond the associated coupling part. The drive shaft is provided in the region of the attachment flange with a coaxial support bore, into which is received the support pin of the tool head.

Abstract: A machine tool to machine a workpiece includes linear slide blocks supported one by the other on a pedestal to present a mounting surface for supporting a workpiece, a support head includes a rotary indexing table that in turn supports an elongated cutter bar the support head to define an outwardly projecting cantilever end portion that is in turn supported by an outboard support, a cutter tool is supported for rotary movement about an axis transverse to the extended length of the cutter bar, a drive means extends along the cutter bar for rotating a cutter tool. The drive to rotate the tool in one embodiment takes the form of a belt extending between pulleys one of which drives the tool and the other is coupled to the electric motor in the drive head. A hydraulic motor is mounted in the cutter bar to rotate a tool according to a second embodiment.

Abstract: A transmission mechanism for a milling device and an improvement in a ram type milling device having a swivel head structure. The ram is movable in opposite longitudinal directions. An auxiliary section is rotatably coupled to the ram for 0.degree.-360.degree. rotation relative thereto. An input head section that carries the output shaft, is rotatably coupled to the auxillary section for 0.degree.-360.degree. rotation relative to the auxillary section and/or the ram. The machine body of the device has a shaft hole formed therein for receiving one of the ends of a milling tool carried by the output shaft. Guide rail and guide feet are also provided for supporting and guiding the milling tool when desired. A milling tool carried therein by this device may be selectively moved in any of six directions or planes, as desired or needed for working on a workpiece.

Abstract: A milling machine cutter tool structured and oriented to perform complex three dimensional contour machining operations and provides for the cutting edges of the cutter to engage the workpiece in the same direction as the feed direction, thereby resulting in maximal cutting efficiency. The cutting tool is composed of a sleeve rotatably mounted to the milling machine, a quill axially movable in the sleeve, a position drive for selectively moving the quill relative to the sleeve, a drive shaft rotatably supported in the quill and connected at a rear end thereof to a cutter drive, a cutter head connected to the opposite forward end of the quill, a worm gear set mounted in the cutter head connecting gearably to the drive shaft, a cutter shaft mounted in the cutter head transversely in relation to the drive shaft and gearably connected to the worm gear set, and a side cutter connected to the cutter shaft, the side cutter supporting teeth extending forwardly of the cutting head.

Abstract: A multi-axis, remote control, mobile, robotic machining center of Cartesian structure having three mutually perpendicular X, Y and Z linear movement axes in which an elongated horizontal ram, adapted to carry various working tools at one outer end thereof, is rigidly supported on a vertical pedestal for movement along the vertical Y axis and linear Z-axis. The ram also is mounted for rotational movement about a horizontal A axis normal to the Y axis and is thereby capable of being selectively positioned in either of two horizontal operating attitudes in which the working tools are operably disposed on opposite sides of the pedestal.

Abstract: The invention relates to the chuck unit of an operating head for automatic machine tools in which the operating head is the type comprising a fork, fitted to the end of a mobile arm and equipped with a number of degrees of freedom, to which the chuck unit is hinged; the chuck unit comprises a chuck and equipment designed to rotate the chuck so that it slides axially.The unit in accordance with the invention is designed for use with a brushless motor and automatic equipment which varies the velocity ratio between the said motor and the chuck.

Abstract: A driving head holder capable of perfectly and effectively holding a driving head on a turret milling machine is provided. The holder includes a cantilevering coupling member having two side walls pivotably mounting therebetween a driving head holding member which includes a middle web having an intermediate hub member having a through hole, two side portions having two cross sectionally T-shaped annular grooves, and a curved peripheral portion integrally forming thereto the web and side portions.

Abstract: This invention relates to a six-axis machine for locating an operator with respect to an object, and more particularly to a versatile machine tool in which the tool can be moved in three lineal directions and three rotational directions in relation to the surface of a workpiece.

Abstract: An improvement in a ram type milling device having a swivel head structure. The ram is movable in opposite longitudinal directions. An auxiliary section is rotatably coupled to the ram for 0-360 degrees rotation relative thereto. An output head section that carries the output shaft, is rotatably coupled to the auxiliary section for 0-360 degrees rotation relative to the auxiliary section and/or the ram. The machine body of the device has a shaft hole formed therein for receiving one of the ends of a milling tool carried by the output shaft. Guide rail and guide feet are also provided for supporting and guiding the milling tool when desired. A milling tool carried therein by this device may be selectively moved in any of six directions or planes, as desired or needed for working on a workpiece.

Abstract: A machining tool, in particular a polishing head and its attachment to mount it to the spindle housing of a milling machine. The invention provides the machining tool with an adapter arranged on the front side of the spindle housing to which the housing of the machining tool is attached, sluable on a transverse plane at a right angle to the spindle axis. The adapter has a coupling for the rotary connection to the horizontal work spindle as well tension devices to compensate for play.

Abstract: This invention is related to a vertical milling machine ram adapter and particularly to one which has a U-shaped body with revolving mechanism set at both lateral sides and the front end to permit the connected milling head ram to make rotation along vertical axis as well as horizontal axis against the overarm of the milling machine so as to perform complicated milling process. The revolving mechanism is comprised of an adapter locking bolt and a circular groove, which adapter locking bolt is inserted through the ram adapter to connect the ram adapter to the overarm or the milling head ram of the milling machine.

Abstract: A machine includes a pair of spaced supports, one of which may mount an operator such as a tool in a spindle and the other of which may mount an object such as a workpiece. The spaced platforms are joined by six powered and extensible legs joined to the respective platforms by universal joints. The length of the legs is individually manipulated to vary the position of the platforms and therefore the object and operator relative to each other in six axes. The powered legs may be hydraulic cylinders or recirculating ball screw driven. The distance between the spaced platforms may be measured by separate instrument arms which join the platforms. The instrument arms may use a digital position device to measure the extension and contraction of the instrument arms or may use a laser interferometer for that purpose. The changes in the instrument arm's lengths may be used to generate signals which are used to control the extension and contraction of the powered legs.

Abstract: In a machine tool provided with a spindle head carrier and a spindle head mounted thereon when a drive shaft supported in the spindle head carrier drives a spindle via gears, an oil circulation chamber is provided for lubricating the gears. The chamber is sealed against the stationary part of the spindle head by sealing members, which are charged with compressed air via compressed pressure supply lines, and which direct compressed air to front sealing surfaces of the sealing members cooperating with rotating opposed sealing surfaces. The pressure ratios and the line cross-section are selected so that a sealing gap exists for the seal between the rotating opposed sealing surfaces and the sealing surfaces of the sealing members for contactless sealing.

Abstract: A chuck head for automatic machine tools comprises a fork mounted on the end of a movable arm and an electrically driven chuck mounted between the arms of the fork. A mechanism effect angular displacements of the chuck is located within the head supporting arm and is connected to the electrically driven chuck by a transmission comprising at least two pairs of bevel gears.

Abstract: A work station having an arch frame which adjustably carries work processing units for performing an operation on work located on a carrier in an archway below the arch frame. The position of the work processing units are adjusted to accomodate different work configurations. The arch frame work station design has particular utility in assembling and machining V engine blocks where models have different V angles.

Abstract: Lathes usually have only two axes of movement for the tool, namely the directions of the displacement of the saddle and cross rest. Since power-driven tools are increasingly being used, especially in NC lathes, in which radial and axial slotting is performed on the workpiece with end mills, for example, there is a need, for example, to vary the width of the slot by slightly shifting the tool in a third direction perpendicular to the first two directions of movement. Precisely in the case of slotting, no continuous adjustment is necessary, as it would be very costly to achieve mechanically. Instead it is sufficient to be able to reach two or three fixedly specified, changeable positions. This can be achieved by an arcuate movement of the tool which will also contain components of the desired third direction of movement, and this can be achieved mechanically either by rotating a part of the tool head or by an eccentrically configured tool socket.

Abstract: A machine tool comprises an upstanding column, a tool-driving unit vertically movable on the column, and a pair of guide rails on a front surface of the column to extend vertically thereon and horizontally spaced apart from each other for guiding the upward and downward movement of the tool-driving unit. The tool-driving unit includes a lift frame on the guide rails and a tilting-type turret head which is supported on a front surface of the lift frame and is rotatable about an axis inclined relative to the longitudinal direction of the frame in a horizontal plane. One of the pair of guide rails is relatively disposed forwardly of the other guide rail, so that the individual guide rails both assume positions close to the turret head thereby to minimize the amount of overhang of the tool-driving unit.

Abstract: A method and arrangement for exchanging a variable number of tool holders in which only one tool holder at a time is brought into working position. The operations involved with accessing a variety of holders, one at a time, to a working position requires movement of minimum mass to the working position adjacent the drive unit--while one or more remaining tool holders are located in a series of accessible independent storage positions or in at least one storage magazine.

Abstract: A silicon wafer diffusion processing quartz boat carrier slot plunge cutter machine is provided that has a vertical rapid traverse power feed variable speed spindle with automatic stop switches controlling down feed and return with spindle speeds generally in the range of 3,000 RPM to 4,500 RPM for effective quartz slot cutting. Work piece table longitudinal and cross travel are manually driven with longitudinal travel for work piece to cutting tool alignment and cross travel being for indexing of specific slotting configurations. A fixed table support is adapted to mounting of various jig types for slotting as desired.

Abstract: A milling and drilling head for a machine tool has an input shaft housed in a stationary case also incorporating a control means drivingly connected to a ring gear which is fast with a moving case portion accommodating at least one tool holding spindle driven off the master spindle of the machine tool and being set at an angle to the X-axis thereof.

Abstract: A milling machine head assembly has a milling machine head mounted on a movable carriage, for movement with the carriage and for angular movement relative to the carriage about a predetermined axis. A motor is mounted on the carriage for movement with the carriage but is maintained stationary during angular movement of the machine head. Drive power is transmitted from the motor to the machine head in any angular position of the machine head within said angular movement. For this purpose, a power transmission is twistable relative to said predetermined axis and extends along said predetermined axis through the carriage from the motor to the machine head in the form of a twistable endless belt. The power transmission may include two parallel shafts comprising a spindle shaft for operating a tool bit, and an auxiliary shaft adapted to be driven off the motor by a first belt via one end of the auxiliary shaft. A belt and pulley transmission interconnects another end of the auxiliary shaft with the spindle shaft.

Abstract: A rotating machining head for automatic tool machines has suction ducts for dust placed inside the head device. This permits the head to have a substantially rounded shape with a minimum encombrance, which is equal in all directions and for any positioning of the head.

Abstract: Machine tool comprising a spindlehead which can be swung into several operating positions. Coupling devices are provided, which in each operating position couple the spindle with a drive shaft from the drive motor or the transmission. In an intermediate position, the spindle is in the area of a tool changer for facilitating an automatic tool exchange.

Abstract: A horizontal drilling and milling machine having a horizontal, rotatable work table and an angle-cutting milling head with a milling spindle and a drive shaft which is driven by the drilling spindle of the headstock. The milling head is rotatable about the axis of the drilling spindle, and can be pivoted into a tool exchanging position about an axis which extends at right angles to the axis of the drilling spindle.

Abstract: An industrial robot device is disclosed which is equipped at a forward end of an arm with a work tool such as a cutting or a grinding tool, and in which there is provided a device such as a friction damper for suppressing sudden movement of the work tool in the direction of the normal displacement thereof towards and away from a workpiece. Damage to the work tool and workpiece due, for instance, to sudden changes of load, is thereby prevented.

Abstract: The head of a plano-milling machine has two jointly rotatable, perpendicularly-related collet spindles journalled on bearings in a box-like housing which can be mounted on the slide of the machine so as to be indexable about the axis of the vertical collet spindle to present the horizontal collet spindle to different vertical faces of a workpiece.The head is journalled to the slide by a combined indexing means and hydrostatic bearing which includes means to lock the head in a chosen angular position. Provision is made for numerical control and automatic tool changing.

Abstract: An attachment is mounted and dismounted onto and from a spindle head or ram of a machine tool having a rotatable spindle by apparatus comprising a collet including a plurality of circumferentially arranged flexible members extending in parallel with the spindle from a surface on which the attachment is to be mounted, and provided with enlarged heads; a clamping rod having an opening facing the surface, a small inner diameter projection formed on the inner surface of the opening, and a large inner diameter portion adapted to receive the heads; a piston-cylinder assembly for reciprocating the clamping rod toward and away from the collet; and a release piston reciprocated in the clamping rod for radially expanding the enlarged heads of the collet.

Abstract: A horizontal drilling and milling machine having a spindle head which can be rotated about an axis set at 45.degree. to a horizontal plane. The spindle head can be arrested in the horizontal and vertical working positions of the spindle sleeve by means of a support housing. The spindle sleeve can be driven via a gear system. The rotary movement of the spindle head is derived from the drive shaft for the spindle sleeve.